Download SEL-9501 AND SEL-9502

SEL-9501 AND SEL-9502
CONTACT ARC SUPPRESSORS
KEY FEATURES
IMPROVE RELIABILITY WHILE PREVENTING CONTACT DAMAGE
Eliminate Contact Arcing in DC Circuits
Reduce contact wear to lower the need for
service and maintenance.
Remove Unnecessary Contacts
Place an SEL Contact Arc Suppressor
over a contact to increase its interrupt
rating and to remove redundant series
connections of several contacts.
Protect Multiple Contacts With a
Single Unit
Place an SEL Contact Arc Suppressor
across multiple contacts in parallel, and
improve their effectiveness.
Reduce Circuit Noise
Minimize false indications or inadvertent
control actions by reducing electrical
noise.
PROTECT EQUIPMENT FROM DAMAGING ARCS WITH SEL CONTACT
ARC SUPPRESSORS
SEL-9501
SEL-9502
• Protects nearly any dc contact up
to 160 Vdc.
• Eliminates faulty circuit breaker
tripping from let-through current on
dc energization.
• Provides affordable contact protection
where high-speed trip or close is not
required.
• Protects contacts in dc circuits up
to 280 Vdc.
• Protects high-speed trip and close
contacts from damage when they
interrupt or close due to a failed
circuit breaker or malfunctioning
auxiliary switch.
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SEL-9501 AND SEL-9502 MAXIMUM LET-THROUGH CURRENT
DURATION AND CIRCUIT BREAKER TRIP COIL CURRENT
Apply SEL-9502 if a 2 ms Trip Pulse Causes the
Breaker to Open
Current
Apply SEL-9501 or SEL-9502 if a 2 ms Trip Pulse Will Not
Open the Breaker
Current
Circuit Breaker Trip
Solenoid Movement
Circuit Breaker Trip
Solenoid Movement
Circuit Breaker Trip Coil
Current on DC Turn-On
Circuit Breaker Trip Coil
Current on DC Turn-On
SEL-9502
Max Conduction
SEL-9502
Max Conduction
SEL-9501
Max Conduction
SEL-9501
Max Conduction
0.1
1
2
Time (ms)
0.1
1
2
Time (ms)
These graphs show a circuit breaker’s trip point compared to the current let-through time on dc turn-on for the SEL-9501 and
SEL-9502. The SEL-9502 prevents unintentional trips by providing minimal current let-through.
The two contacts on the left side were
connected in series to interrupt current.
The single right contact was protected by the
SEL-9501 under the same test conditions.
The unprotected contacts show burning, pitting, and discolorization, while the contact
protected by the SEL-9501 remains undamaged.
3
(+) Red
SEL-9501
52b
SEL-9502
TYPICAL CONTACT ARC SUPPRESSOR APPLICATIONS
(–) Black
Close Coil
+DC
+DC
DC
(+) Red
SEL-9501
Close
(+) Red
(+) Red
TRIP SEL-9501
Raise
(–) Black
Black
((+–))Red
(–) Black
(+) Red
SEL-9501
52b
SEL-9501
52a
(–) Black
(–) Black
Lower Control
Trip Coil
Close Coil
DC
DC
SEL-9502
(+) Red
(+) Red
SEL-9501
Raise
SEL-9501
Lower
(–) Black
(–) Black
Lower Control
Lower Control
(+) Red
(+) Red
SEL-9501
52b
SEL-9501
52a
(–) Black
(–) Black
Close Coil
Trip Coil
DC
DC
Typical SEL-9501 Contact Arc Suppressor Application
(160 Vdc maximum)
(+) Red
SEL-9501
Raise
(–) Black
4
(+) Red
Lower Control
SEL-9501
Lower
(–) Black
Lower Control
+DC
TRIP
(+) Red
(+) Red
(–) Black
(–) Black
SEL-9502
SEL-9502
To apply the SEL-9502 to circuits with load
current less than 1 A, wrap the negative terminal
lead through the hole in the SEL-9502 twice, as
shown. Placing two turns through the current
sense circuit of the SEL-9502 allows it to reliably
sense currents as low as 0.4 A.
(+) Red
SEL-9501
52a
(–) Black
Trip Coil
DC
Typical SEL-9502 Contact Arc Suppressor Application
(280 Vdc maximum)
(+) Red
SEL-9501
Lower
(–) Black
Lower Control
5
APPLICATION SUMMARY
INSTALLATION SUMMARY
EXTEND THE LIFE OF YOUR CONTACTS
Observe the proper polarity when connecting the SEL-9501 or
SEL-9502. Failure to do so may cause equipment misoperation or
damage the contact arc suppressor.
• Increase contact reliability and dependability.
• Reduce destructive dc circuit overvoltages.
• Smoothly interrupt the current, and let the SEL Contact
Arc Suppressors dissipate the inductive energy as heat,
instead of welding or vaporizing the metal of the contacts.
• Increase contact ratings economically.
CHOOSE THE APPROPRIATE SEL CONTACT ARC
SUPPRESSOR FOR YOUR APPLICATION
• The SEL-9502 has a lower current let-through time to
ensure you won’t accidentally trip a circuit breaker on dc
energization.
• Use the SEL-9502 in higher-voltage operations.
• The SEL-9501 can be installed in parallel with most dc
contacts.
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SEL-9501
Easily connect the red lead terminal to contact +Vdc and the
black lead terminal to contact –Vdc.
SEL-9502
1.Use the supplied bracket to mount the SEL-9502 to any
available surface close to the protected contact, keeping the
leads as short as possible.
2.Connect the SEL-9502 across the contact, routing the
connection to the negative terminal of the contact through
the hole in the SEL-9502 (in either direction).
3.Connect the load to the negative terminal of the SEL-9502.
SPECIFICATION SUMMARY
SEL-9501
• Voltage rating: 160 Vdc
• Circuit clamping voltage: <400 V
• Let-through current time at dc turn-on: 2000 μs
• Leakage current: <150 μA at 125 Vdc
• Not for use with reed contacts
SEL-9502
• Voltage rating: 280 Vdc
• Circuit clamping voltage: <500 V
• Let-through current time at dc turn-on: 100 μs
• Leakage current: <150 μA at 125 Vdc
• Not for use with reed contacts
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MAKING ELECTRIC POWER SAFER,
MORE RELIABLE, AND MORE ECONOMICAL
SCHWEITZER ENGINEERING
LABORATORIES, INC.
Tel:+1.509.332.1890
Email:[email protected]
Web:www.selinc.com
© 2004–2013 by Schweitzer Engineering Laboratories, Inc.
PF00067 · 20131223